Some friends don't understand the difference between the square meter and the extended meter used in the installation process of the iron guardrail, so they don't understand how to calculate the installation quantities of the iron guardrail.

　　通常情況下，鐵藝護欄的安裝工程量是按照計算的，也可以按照圖紙的尺寸按照投影面積進行計算得出。延長米是在計算重量的時候使用到的。計算面積不適用延長米。

　　In general, the installation quantity of iron guardrail is calculated in square meters, and it can also be calculated according to the size of the drawing and the projected area. The extension meter is used to calculate the weight. The calculation area does not apply to the extension meter.

　　一般情況下，濟南鐵藝護欄生產廠家是按照進行報價的，所以安裝工程量按照計算是更簡便快捷的方法。

　　In general, Jinan iron guardrail manufacturers quote according to square meters, so the calculation of installation quantities according to square meters is the most convenient and quick method.